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CSc 337

CSc 337. Lecture 3: Page Sections and More CSS. The vertical-align property. can be  top ,  middle ,  bottom ,  baseline  (default),  sub ,  super ,  text-top ,  text-bottom , or a length value or  % baseline  means aligned with bottom of non-hanging letters. Vertical Align.

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CSc 337

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  1. CSc 337 Lecture 3: Page Sections and More CSS

  2. The vertical-align property • can be top, middle, bottom, baseline (default), sub, super, text-top, text-bottom, or a length value or % • baseline means aligned with bottom of non-hanging letters

  3. Vertical Align img { vertical-align: middle } img { vertical-align: bottom } img { vertical-align: top }

  4. Common bug: space under image • <p style="background-color: red; padding: 0px; margin: 0px"> • <imgsrc="images/smiley.png" alt="smile" /> • </p> HTML output • red space under the image, despite padding and margin of 0 • this is because the image is vertically aligned to the baseline of the paragraph (not the same as the bottom) • setting vertical-align to bottom fixes the problem (so does setting line- height to 0px)

  5. Motivation for page sections • want to be able to style individual elements, groups of elements, sections of text or of the page • (later) want to create complex page layouts

  6. The HTML id attribute • <p>Spatula City! Spatula City!</p> • <p id="mission">Our mission is to provide the most • spectacular spatulas and splurge on our specials until our • customers <q>esplode</q> with splendor!</p> HTML Spatula City! Spatula City! Our mission is to provide the most spectacular spatulas and splurge on our specials until our customers “esplode” with splendor! output • allows you to give a unique ID to any element on a page • each ID must be unique; can only be used once in the page

  7. Linking to sections of a web page • <p>Visit <a href= • "http://www.textpad.com/download/index.html#downloads"> • textpad.com</a> to get the TextPad editor.</p> • <p><a href="#mission">View our Mission Statement</a></p> HTML Visit textpad.com to get the TextPad editor. View our Mission Statementoutput • a link target can include an ID at the end, preceded by a # • browser will load that page and scroll to element with given ID

  8. CSS idselectors #mission { font-style: italic; font-family: "Garamond", "Century Gothic", serif; } CSS Spatula City! Spatula City! Our mission is to provide the most spectacular spatulas and splurge on our specials until our customers ”esplode” with splendor! output • applies style only to the paragraph that has the ID of mission • element can be specified explicitly: p#mission {

  9. The HTML class attribute • <p class="shout">Spatula City! Spatula City!</p> • <p class="special">See our spectacular spatula specials!</p> • <p class="special">Today only: satisfaction guaranteed.</p> HTML Spatula City! Spatula City! See our spectacular spatula specials! Today only: satisfaction guaranteed. output • classes are a way to group some elements and give a style to only that group(“I don't want ALL paragraphs to be yellow, just these three...”) • unlike an id, a class can be reused as much as you like on the page

  10. CSS class selectors • .special { /* any element with class="special" */ • font-weight: bold; • } • p.shout { /* only p elements with class="shout" */ • color: red; • font-family: cursive; • } CSS Spatula City! Spatula City! See our spectacular spatula specials! Today only: satisfaction guaranteed. output • applies rule to any element with class special, or a p with class shout

  11. CSS context selectors selector1 selector2 { properties } CSS • applies the given properties to selector2 only if it is inside a selector1 on the page selector1 > selector2 { properties } CSS • applies the given properties to selector2 only if it is directly inside a selector1 on the page (selector2 tag is immediately inside selector1 with no tags in between)

  12. Context selector example • <p>Shop at <strong>Hardwick's Hardware</strong>...</p> • <ul> • <li>The <strong>best</strong> prices in town!</li> • <li>Act while supplies last!</li> • </ul> HTML li strong { text-decoration: underline; } CSS • Shop at Hardwick's Hardware... • Thebest prices in town! • Act while supplies last! ouput

  13. Inline sections: <span> • an inline element used purely as a range for applying styles <h2>Spatula City! Spatula City!</h2> <p>See our <span class="special">spectacular</span> spatula specials!</p> <p>We'll beat <span class="shout">any advertised price</span>!</p> HTML Spatula City! Spatula City! See our  spatula specials! We'll beat any advertised price! output spectacular • has no onscreen appearance, but you can apply a style or ID to it, which will be applied to the text inside the span

  14. The CSS Box Model • for layout purposes, every element is composed of: • the actual element's content • a border around the element • padding between the content and the border (inside) • a margin between the border and other content (outside) • width = content width + L/R padding + L/R border + L/R margin height = content height + T/B padding + T/B border + T/B margin • IE6 doesn't do this right

  15. Document flow - block and inline elements

  16. CSS properties for borders • h2 { border: 5px solid red; } CSS This is a heading. output • thickness (specified in px, pt, em, or thin, medium, thick) • style  (none, hidden, dotted, dashed, double, groove, inset, outset, ridge, solid) • color (specified as seen previously for text and background colors)

  17. More border properties

  18. Border example 2 • h2 { • border-left: thick dotted #CC0088; • border-bottom-color: rgb(0, 128, 128); • border-bottom-style: double; • } CSS This is a heading. output • each side's border properties can be set individually • if you omit some properties, they receive default values (e.g. border-bottom-width above)

  19. Rounded corners with border-radius • p { • border: 3px solid blue; • border-radius: 12px; • padding: 0.5em; • } CSS output This is a paragraph. This is another paragraph.It spans multiple lines. • each side's border radius can be set individually, separated by spaces

  20. CSS properties for padding

  21. CSS properties for margins

  22. Margin example 1 • p { • margin: 50px; • background-color: fuchsia; • } CSS This is the first paragraph This is the second paragraph • notice that margins are always transparent (they don't contain the element's background color, etc.)

  23. Margin example 2 • p { • margin-left: 8em; • background-color: fuchsia; • } CSS output This is the first paragraph This is the second paragraph • each side's margin can be set individually

  24. CSS properties for dimensions • p { width: 350px; background-color: yellow; } • h2 { width: 50%; background-color: aqua; } CSS output This paragraph uses the first style above An h2 heading

  25. Centering a block element: auto margins • p { • margin-left: auto; • margin-right: auto; • width: 750px; • } CSS output Loremipsum dolor sit amet, consecteturadipisicingelit, sed do eiusmodtemporincididuntutlabore et dolore magna aliqua. • to center inline elements within a block element, use • text-align: center; • works best if width is set (otherwise, may occupy entire width of page)

  26. The CSS float property • afloating element is removed from normal document flow • underlying text wraps around it as necessary

  27. Float example • <imgsrc="images/koala.jpg" alt="Koala" class="headericon" /> • Loremipsum dolor sit amet, consecteturadipiscingelit.... HTML img.headericon { float: left; } CSS Loremipsum dolor sit amet, consecteturadipiscingelit. Aliquamscelerisquepurusutdui mollis, sedmalesuadaleopretium. Morbibibendum mi at lacus rutrumconvallis. Duis id eros dolor. In id erosblanditlectusviverrafacilisis at commodovelit. Craspretiumnunc id nislelementum, at interdumodioblandit. Donecluctusrutrumiaculis. Praesentluctus ante et cursussuscipit. Nullamcongueegestasloremnecluctus. Donectincidunttortor mi, necultriciesorcibibendum a. Aliquamviverrametusnec ligula variusfeugiat. In lacinia ligula accumsantortorporttitorornare. Donecinterdummattispurus sit ametultrices. output

  28. Floating content and width • I am not floating, no width set I am floating right, no width set I am floating right, no width set, but my text is very long so this paragraph doesn't really seem like it's floating at all, darn I am not floating, 45% width I am floating right, 45% width • often floating elements should have a width property value • if no width is specified, other content may be unable to wrap around the floating element

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